Movable doorsill of civil air defense door

Abstract

The utility model discloses a movable doorsill of a civil air defense door, which relates to the technical field of civil air defense doors and comprises an embedded box embedded at the bottom of a door opening and with the top surface flush with the ground, a movable doorsill body movably arranged in the matched embedded box, and a mounting mechanism arranged in the movable doorsill body. The pin rod can be inserted into the pin hole formed in the door opening by lifting the movable doorsill body, shaking the rocking handle, matching with transmission of the transmission mechanism and connection of the two-way screw rod, so that the movable doorsill body is quickly lifted, mounted and fixed, and the ladder block in the supporting mechanism can be automatically cushioned at the bottom of the lifted movable doorsill body under the action of elastic force, so that the movable doorsill body can be quickly lifted, mounted and fixed. The stability of the movable doorsill body after being lifted and installed is improved, the whole process is easy and rapid to operate, so that rapid installation of the doorsill is achieved, the doorsill does not need to be found and conveyed in the doorsill installation period, time is saved, and the doorsill installation efficiency is improved.

Description

Technical Field

[0001] This utility model relates to the field of civil defense door technology, and in particular to a movable threshold for a civil defense door. Background Technology

[0002] Civil defense doors are the entrances and exits of civil defense projects. They are clearly categorized, including ordinary single and double-leaf protective airtight doors and airtight doors, as well as single and double-leaf protective airtight doors and airtight doors with movable thresholds. The thresholds of civil defense doors include fixed thresholds and movable thresholds. Fixed thresholds are welded to both ends of the door frame during manufacturing; these thresholds cannot be moved, hindering vehicle passage and significantly impeding the transport of supplies. Movable thresholds, on the other hand, are concealed in other locations during peacetime and are only installed during the transition between peacetime and wartime, facilitating vehicle passage and the transport of supplies during peacetime.

[0003] CN219509494U discloses "a movable threshold for a civil defense door, comprising several sets of threshold segments. Each set of threshold segments includes a first L-shaped threshold segment, a second L-shaped threshold segment, and a locking component. Several mounting grooves and several inverted T-shaped grooves are provided in the ground. When the first L-shaped threshold segment and the second L-shaped threshold segment are installed in the mounting grooves, the upper surfaces of both the first L-shaped threshold segment and the second L-shaped threshold segment are flush with the ground. The threshold segment set in this utility model is flush with the ground in peacetime, but can be quickly flipped into a threshold in wartime, making installation convenient and fast."

[0004] Regarding the aforementioned technologies, the inventors believe that when installing movable thresholds during wartime, it is necessary to remove the first L-shaped threshold segment and the second L-shaped threshold segment from the mounting slot or other slots, then splice the first L-shaped threshold segment and the second L-shaped threshold segment and place them into the corresponding slots, and then use multiple screws to lock and install the first L-shaped threshold segment and the second L-shaped threshold segment. This makes the installation process of movable thresholds cumbersome, inconvenient, and time-consuming, and therefore needs improvement. Utility Model Content

[0005] This utility model addresses the shortcomings of existing technologies by providing a movable threshold for a civil defense door. The specific technical solution is as follows:

[0006] A movable threshold for a civil defense door includes a pre-embedded box embedded in the bottom of the door opening with its top surface flush with the ground, a movable threshold body movably disposed in the matching pre-embedded box, and an installation mechanism disposed in the movable threshold body. The installation mechanism includes a bidirectional screw rod rotatably disposed in the movable threshold body, two limiting plates respectively threaded at both ends of the bidirectional screw rod and slidably connected in the movable threshold body, and a pin rod fixedly disposed on one side of the limiting plate for engaging with a pin hole opened in the door opening after the movable threshold is raised.

[0007] The top of the movable threshold body is provided with a crank for driving the bidirectional lead screw to rotate. A transmission mechanism is provided between the crank and the bidirectional lead screw. The bottom of the inner wall of the pre-embedded box is provided with a support mechanism for moving to the bottom of the movable threshold body to raise and support the movable threshold body after it is raised.

[0008] By adopting the above technical solution, by raising the movable threshold body and shaking the crank, in conjunction with the transmission mechanism and the connection of the two-way screw, the pin can be inserted into the pin hole opened in the door opening, thereby quickly raising, installing and fixing the movable threshold body. The whole process is simple and fast, thus realizing the rapid installation of the threshold. Moreover, during the threshold installation, there is no need to find or transport the threshold, saving time.

[0009] Optionally, a limiting groove is formed in the movable sill body, the bidirectional lead screw is rotatably connected in the limiting groove of the movable sill body, the limiting plate is slidably connected in the limiting groove of the movable sill body, and the transmission mechanism includes a first bevel gear fixedly disposed in the middle of the outer wall of the bidirectional lead screw and a second bevel gear meshing with the top of the first bevel gear. A rotating rod rotatably connected in the movable sill body is fixedly disposed in the second bevel gear, and the rocker arm is fixedly connected to the top of the rotating rod.

[0010] By adopting the above technical solution, when the operator cranks the handle, the rotating rod will rotate. After the rotating rod rotates, it will drive the second bevel gear to rotate. After the second bevel gear rotates, it will drive the bidirectional lead screw to rotate through the meshing first bevel gear.

[0011] Optionally, the top of the movable threshold body is provided with a groove, the crank is located in the groove of the movable threshold body, a protective cover is rotatably connected to the top of the groove of the movable threshold body, and a handle is fixedly provided in the groove of the movable threshold body.

[0012] By adopting the above technical solution, the protective cover can cover the opening at the top of the groove, thereby protecting the handle and crank. Workers can lift or press down the movable threshold by holding the handle.

[0013] Optionally, the support mechanism includes a step block that is slidably disposed at the bottom of the inner wall of the pre-embedded box and abuts against one side of the movable threshold body, and a return spring that is fixedly disposed on the inner wall of the pre-embedded box for pushing one end of the step block to the bottom of the movable threshold body after the movable threshold body is raised. A telescopic rod is fixedly disposed between the side of the step block near the return spring and the inner wall of the pre-embedded box.

[0014] By adopting the above technical solution, the ladder blocks inside the support mechanism will automatically be placed under the bottom of the raised movable threshold body under the elastic force, thereby improving the stability of the movable threshold body after it is raised and installed.

[0015] Optionally, the top of the pre-embedded box is provided with a triangular groove, and one end of the movable threshold body is fixedly provided with a top rod that abuts against the inclined surface of the triangular groove and is used to push the step block open from the bottom of the movable threshold body when the movable threshold body descends.

[0016] By adopting the above technical solution, after the movable threshold moves vertically downward, the step blocks can be pushed open laterally from the bottom of the movable threshold by the lateral pressure of the triangular groove and the top rod, so that the step blocks will not block the continued descent of the movable threshold.

[0017] In summary, this utility model has at least one of the following beneficial effects:

[0018] 1. By raising the movable threshold and cranking the handle, the transmission mechanism and the connection of the two-way lead screw can insert the pin into the pin hole opened in the doorway, thereby quickly raising, installing and fixing the movable threshold. The step blocks in the support mechanism will automatically pad the bottom of the raised movable threshold under the elastic force, improving the stability of the movable threshold after installation. The whole process is simple and quick, thus realizing the rapid installation of the threshold. During the installation of the threshold, there is no need to find or transport the threshold, saving time and improving the efficiency of threshold installation.

[0019] 2. By lowering the movable door sill, it can be retracted into the pre-embedded box for concealment, thus not affecting vehicle passage. After the movable door sill moves vertically downward, the lateral pressure from the triangular groove and the top rod can push the step block laterally open from the bottom of the movable door sill, ensuring that the step block does not obstruct the further descent of the movable door sill. The entire process of raising or lowering the movable door sill can be completed simply by moving the movable door sill up and down and cranking the handle. It is convenient, quick, and suitable for large-scale promotion. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0021] Figure 2 This is a front sectional view of the overall structure of this utility model;

[0022] Figure 3 This is a schematic diagram of the movable threshold after installation of this utility model;

[0023] Figure 4 This is the utility model Figure 2 Enlarged view of structure A in the middle.

[0024] Explanation of reference numerals in the attached drawings: 1. Embedded box; 2. Movable threshold body; 21. Limiting groove; 22. Two-way lead screw; 23. Limiting plate; 24. Pin; 25. First bevel gear; 26. Second bevel gear; 27. Rotating rod; 28. Crank handle; 29. ​​Groove; 3. Protective cover plate; 4. Step block; 41. Return spring; 42. Triangular groove; 43. Top rod; 44. Telescopic rod. Detailed Implementation

[0025] The following is in conjunction with the appendix Figure 1-4 The present invention will be described in further detail below.

[0026] This utility model discloses a movable threshold for a civil defense door, referring to... Figure 1-2 The system includes a pre-embedded box 1, a movable threshold body 2, and an installation mechanism. The pre-embedded box 1 is pre-embedded at the bottom of the door opening and its top surface is flush with the ground. The movable threshold body 2 is movably installed in the matching pre-embedded box 1, so that the movable threshold body 2 is hidden inside the pre-embedded box 1, and the pre-embedded box 1 is hidden in the ground, so that the movable threshold as a whole will not obstruct the passage of vehicles.

[0027] Reference Figure 1-3 The installation mechanism includes a bidirectional lead screw 22 rotatably disposed within the movable threshold body 2, two limiting plates 23 respectively threaded at both ends of the bidirectional lead screw 22 and slidably connected within the movable threshold body 2, and a pin 24 fixedly disposed on one side of the limiting plate 23 for engaging with the pin hole opened in the door opening after the movable threshold is raised. The two ends of the bidirectional lead screw 22 have opposite thread directions. When the movable threshold body 2 is hidden inside the embedded box 1, one end of the pin 24 can be inserted into several fixing holes opened in the inner side wall of the embedded box 1, thereby fixing the movable threshold body 2 inside the embedded box 1.

[0028] After the bidirectional lead screw 22 rotates, it will drive the two limit plates 23 to move laterally closer or further apart, thereby driving the pin 24 to move. When the movable threshold body 2 is raised, one end of the pin 24 can be inserted into the matching pin hole opened in the door opening, thereby supporting and fixing the raised movable threshold body 2.

[0029] Reference Figure 1-2 A limiting groove 21 is provided inside the movable threshold body 2. A bidirectional screw 22 is rotatably connected to the limiting groove 21 of the movable threshold body 2. A limiting plate 23 is slidably connected to the limiting groove 21 of the movable threshold body 2. The movable threshold body 2 can support and limit the bidirectional screw 22 through the limiting groove 21, and the limiting groove 21 can limit the matching limiting plate 23, so that the limiting plate 23 can move laterally.

[0030] Reference Figure 2 and Figure 4The top of the movable sill body 2 is provided with a rocker arm 28 for driving the bidirectional lead screw 22 to rotate. A transmission mechanism is provided between the rocker arm 28 and the bidirectional lead screw 22. The transmission mechanism includes a first bevel gear 25 fixedly disposed in the middle of the outer wall of the bidirectional lead screw 22, and a second bevel gear 26 meshing with the top of the first bevel gear 25. A rotating rod 27 rotatably connected inside the movable sill body 2 is fixedly disposed inside the second bevel gear 26. The rocker arm 28 is fixedly connected to the top of the rotating rod 27. The rotating rod 27 consists of a vertical rod and a ring fixedly disposed in the middle of the outer wall of the vertical rod. The ring of the rotating rod 27 is rotatably connected inside the movable sill body 2, so that the rotating rod 27 can rotate inside the movable sill body 2 without disengaging.

[0031] When the operator cranks the handle 28, it will cause the rotating rod 27 to rotate. After the rotating rod 27 rotates, it will cause the second bevel gear 26 to rotate. After the second bevel gear 26 rotates, it will drive the bidirectional lead screw 22 to rotate through the meshing first bevel gear 25.

[0032] Reference Figure 2 and Figure 4 The movable threshold body 2 has a groove 29 on its top. The crank handle 28 is located in the groove 29 of the movable threshold body 2. A protective cover plate 3 is rotatably connected to the top of the groove 29 of the movable threshold body 2. A handle is fixedly installed in the groove 29 of the movable threshold body 2. The groove 29 can hide and protect the handle and crank handle 28. The protective cover plate 3 can cover the opening at the top of the groove 29, thereby further protecting the handle and crank handle 28. One end of the protective cover plate 3 can be locked to the movable threshold body 2 by a lock, making the movable threshold body 2 difficult to be stolen. The staff can lift or press down the movable threshold body 2 by holding the handle.

[0033] Reference Figure 1-2 The bottom of the inner wall of the embedded box 1 is provided with a support mechanism for moving to the bottom of the movable threshold 2 to raise and support the movable threshold 2 after it is raised. The support mechanism includes a step block 4 that is slidably disposed on the bottom of the inner wall of the embedded box 1 and abuts against one side of the movable threshold 2, and a return spring 41 that is fixedly disposed on the inner wall of the embedded box 1 for pushing one end of the step block 4 to the bottom of the movable threshold 2 after the movable threshold 2 is raised. The return spring 41 is fixedly connected to the step block 4. When the movable threshold 2 is raised, the return spring 41 will push the step block 4 to the bottom of the movable threshold 2, so that one end of the step block 4 enters the bottom of the movable threshold 2, so that the step block 4 can raise and support the movable threshold 2, thereby improving the stability of the movable threshold 2 after it is raised and installed.

[0034] Reference Figure 2 A telescopic rod 44 is fixed between the side of the step block 4 near the return spring 41 and the inner wall of the embedded box 1. The telescopic rod 44 can connect the step block 4 and the embedded box 1 and limit the step block 4 so that the step block 4 can only move laterally.

[0035] Reference Figure 2 The top of the pre-embedded box 1 is provided with a triangular groove 42. One end of the movable threshold body 2 is fixedly provided with a top rod 43 that fits and abuts against the inclined surface of the triangular groove 42 and is used to push the step block 4 from the bottom of the movable threshold body 2 when the movable threshold body 2 descends. The bottom of the top rod 43 is provided with an inclined surface, and the inclined surface of the top rod 43 is adapted to the inner inclined surface of the triangular groove 42.

[0036] When the movable threshold 2 moves vertically downward, it will cause the top rod 43 to descend. At this time, under the guidance of the inclined surface inside the triangular groove 42, the step block 4 will be pushed towards the return spring 41 to squeeze the return spring 41. At the same time, one end of the step block 4 will disengage from the bottom of the movable threshold 2, thereby pushing the step block 4 horizontally open from the bottom of the movable threshold 2 so that the step block 4 will not block the continued descent of the movable threshold 2.

[0037] The implementation principle of a movable threshold for a civil defense door according to an embodiment of this utility model is as follows:

[0038] When it is necessary to raise and install the movable threshold 2 during wartime, the staff can use one hand to lift the protective cover 3 and hold the handle to raise the movable threshold 2, and then use the other hand to rotate the crank 28 to drive the rotating rod 27 to rotate. After the rotating rod 27 rotates, it will drive the second bevel gear 26 to rotate. After the second bevel gear 26 rotates, it will drive the bidirectional lead screw 22 to rotate through the meshing first bevel gear 25.

[0039] After the bidirectional lead screw 22 rotates, it will drive the two limit plates 23 to move laterally closer or further apart, thereby driving the pin 24 to move. When the movable threshold body 2 is raised, one end of the pin 24 can be inserted into the matching pin hole opened in the door opening, thereby supporting and fixing the raised movable threshold body 2.

[0040] At the same time, after the movable threshold 2 is raised, the return spring 41 will push the step block 4 towards the bottom of the movable threshold 2, so that one end of the step block 4 enters the bottom of the movable threshold 2, so that the step block 4 can raise and support the movable threshold 2, and improve the stability of the movable threshold 2 after it is raised and installed.

[0041] When the movable sill 2 needs to be lowered and hidden in the pre-embedded box 1, the operator can reverse the crank handle 28 to fully retract the pin 24 into the movable sill 2 and press down on the movable sill 2. After the movable sill 2 moves vertically downward, it will drive the top rod 43 to descend. At this time, under the guidance of the inclined surface in the triangular groove 42, the step block 4 will be pushed towards the return spring 41, thereby pushing the step block 4 laterally open from the bottom of the movable sill 2 until the movable sill 2 is fully retracted into the pre-embedded box 1, so that the movable sill 2 can be retracted into the pre-embedded box 1 for hiding, thus not affecting the passage of vehicles.

[0042] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A movable threshold for a civil defense door, comprising an embedded box (1) pre-embedded at the bottom of the door opening with its top surface flush with the ground, a movable threshold body (2) movably disposed within the matching embedded box (1), and an installation mechanism disposed within the movable threshold body (2), characterized in that: The installation mechanism includes a bidirectional screw (22) rotatably disposed in the movable threshold body (2), two limiting plates (23) respectively threaded at both ends of the bidirectional screw (22) and slidably connected in the movable threshold body (2), and a pin (24) fixedly disposed on one side of the limiting plate (23) for fitting into the pin hole opened in the door opening after the movable threshold is raised. The top of the movable threshold body (2) is provided with a rocker arm (28) for driving the bidirectional lead screw (22) to rotate. A transmission mechanism is provided between the rocker arm (28) and the bidirectional lead screw (22). The bottom of the inner wall of the pre-embedded box (1) is provided with a support mechanism for moving to the bottom of the movable threshold body (2) to raise and support the raised movable threshold body (2).

2. The movable threshold of a civil defense door according to claim 1, characterized in that: The movable threshold body (2) has a limiting groove (21) inside, the bidirectional screw (22) is rotatably connected in the limiting groove (21) of the movable threshold body (2), and the limiting plate (23) is slidably connected in the limiting groove (21) of the movable threshold body (2).

3. The movable threshold of a civil defense door according to claim 1, characterized in that: The transmission mechanism includes a first bevel gear (25) fixedly disposed in the middle of the outer wall of the bidirectional lead screw (22), and a second bevel gear (26) meshing with the top of the first bevel gear (25).

4. The movable threshold of a civil defense door according to claim 3, characterized in that: The second bevel gear (26) is fixedly provided with a rotating rod (27) that is rotatably connected to the movable threshold body (2), and the rocker arm (28) is fixedly connected to the top of the rotating rod (27).

5. The movable threshold of a civil defense door according to claim 4, characterized in that: The movable threshold body (2) has a groove (29) on its top, and the rocker arm (28) is located in the groove (29) of the movable threshold body (2).

6. The movable threshold of a civil defense door according to claim 5, characterized in that: The top of the groove (29) of the movable threshold body (2) is rotatably connected to a protective cover plate (3), and a handle is fixedly provided in the groove (29) of the movable threshold body (2).

7. The movable threshold of a civil defense door according to claim 1, characterized in that: The support mechanism includes a step block (4) that is slidably disposed at the bottom of the inner wall of the pre-embedded box (1) and abuts against one side of the movable threshold body (2), and a return spring (41) that is fixedly disposed on the inner wall of the pre-embedded box (1) for pushing one end of the step block (4) to the bottom of the movable threshold body (2) after the movable threshold body (2) is raised. A telescopic rod (44) is fixedly disposed between the side of the step block (4) near the return spring (41) and the inner wall of the pre-embedded box (1).

8. The movable threshold of a civil defense door according to claim 7, characterized in that: The pre-embedded box (1) has a triangular groove (42) on the top, and the bottom of one end of the movable threshold body (2) is fixedly provided with a top rod (43) that fits into the inclined surface of the triangular groove (42) and is used to push the step block (4) from the bottom of the movable threshold body (2) when the movable threshold body (2) descends.

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